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Method for preparing furfuraldehyde through hemicellulose by use of continuous flow microchannel reactor

A micro-channel reactor, channel reactor technology, applied in chemical recovery, organic chemistry and other directions, can solve the problems of ungiven reaction time, low yield, etc., to solve the problem of serious corrosion of equipment, small amount of reaction materials, and cost reduction Effect

Active Publication Date: 2017-07-25
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods do not give the reaction time, and the yield is still low

Method used

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  • Method for preparing furfuraldehyde through hemicellulose by use of continuous flow microchannel reactor
  • Method for preparing furfuraldehyde through hemicellulose by use of continuous flow microchannel reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The continuous flow microchannel reactor used is the enhanced mass transfer microchannel reactor of Corning Corporation of the United States, (the mode of the reactor is "straight channel functional module" + "heart-shaped" structural functional module). figure 1 1. Determine the connection mode of the microchannel reactor, the number of mixed reaction modules is determined according to the flow rate and reaction residence time, and the heating medium is heat transfer oil.

[0044] The hemicellulose raw material comes from the turbid liquid with a hemicellulose content of 15-25% or the solid matter with a hemicellulose content of 70-80% recovered from chemical fiber waste liquid, which is formulated into an aqueous solution with a hemicellulose content of 12wt%. Adding a polymerization inhibitor in the medium, the hemicellulose aqueous solution containing the polymerization inhibitor and the concentrated sulfuric acid of the catalyst are controlled by a metering pump to ...

Embodiment 2

[0052] The microchannel reactor is an enhanced mass transfer microchannel reactor from Corning Corporation of the United States. The reaction system is assembled from multiple modules; the material of the module is silicon carbide and special glass; the microchannel structure in the module is divided into direct current channel There are two types of structure and enhanced mixed channel structure, the straight channel is a tubular structure, the enhanced mixed channel structure is a heart-shaped structure, and the hydraulic diameter of the channel is 8mm; the continuous flow microchannel reactor used (straight channel functional module + "heart-shaped" Structural function module) process, refer to figure 1 1. Determine the connection mode of the microchannel reactor, the number of mixed reaction modules is determined according to the flow rate and reaction residence time, and the heating medium is heat transfer oil.

[0053] The hemicellulose raw material comes from the turbid...

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Abstract

The invention belongs to the field of organic synthesis, and specifically a method for preparing furfuraldehyde through hemicellulose by use of a continuous flow microchannel reactor. The method comprises the following steps: controlling a mole ratio of the hemicellulose aqueous solution containing polymerization inhibitor to a catalyst through a metering pump; enabling the hemicellulose aqueous solution and the catalyst to enter the micro channel reactor to perform the mixing reaction; after the mixing reaction is finished, continuously passing through a series of enhanced mass transfer type micro-channel modules and a flow type micro-channel module, after the reaction process is finished, enabling the product to flow out from the outlet of the reactor and then enter a gas-liquid separator to perform the gas-liquid separation, wherein the furfuraldehyde and water vapor mixed gas enters a fractionating tower after being discharged from an upper gas-guiding tube through a throttling valve, and the liquid falls into the separator. By use of the method disclosed by the invention, the hemicellulose recycled by the waste lye in a chemical fiber industry is used as the raw material, the hemicellulose is directly converted into the furfuraldehyde by use of the continuous micro-channel reactor; by use of the way of separating and recycling the catalyst, the yield and the economic benefit are improved, the pollution is lowered, and the ecologic environment is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis applications, and relates to a technology for producing furfural by using a continuous method of hemicellulose recovered from chemical fiber waste liquid, in particular to a method for preparing furfural from hemicellulose by using a continuous flow microchannel reactor. Background technique [0002] Furfural is an important basic organic chemical raw material that cannot be synthesized by chemical methods at present. It is the only unsaturated organic chemical with large specific volume obtained from sugar compounds. Its chemical properties are very active. Furfural and its Derivatives are widely used organic chemical intermediates. In addition, furfural can also generate 5-hydroxymethylfurfural through hydroxymethylation with formaldehyde, and can also be used as a raw material to prepare gasoline, diesel and aviation kerosene. Methyl tetrahydrofuran generated by furfural through hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/48
CPCY02P20/584C07D307/48
Inventor 武长安雷林唐印刘朝慧李旭初郭志刚王明权李刚张帮成
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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